Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | ||
24 | #include "avcodec.h" | |
25 | #include "libavutil/mem.h" | |
26 | ||
27 | ||
28 | static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, | |
29 | uint8_t **poutbuf, int *poutbuf_size, | |
30 | const uint8_t *buf, int buf_size, int keyframe){ | |
31 | unsigned int *state= bsfc->priv_data; | |
32 | int amount= args ? atoi(args) : (*state % 10001+1); | |
33 | int i; | |
34 | ||
35 | if(amount <= 0) | |
36 | return AVERROR(EINVAL); | |
37 | ||
38 | *poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE); | |
39 | if (!*poutbuf) | |
40 | return AVERROR(ENOMEM); | |
41 | ||
42 | memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); | |
43 | for(i=0; i<buf_size; i++){ | |
44 | (*state) += (*poutbuf)[i] + 1; | |
45 | if(*state % amount == 0) | |
46 | (*poutbuf)[i] = *state; | |
47 | } | |
48 | return 1; | |
49 | } | |
50 | ||
51 | AVBitStreamFilter ff_noise_bsf={ | |
52 | .name = "noise", | |
53 | .priv_data_size = sizeof(int), | |
54 | .filter = noise, | |
55 | }; |